[RH-SSO] Refactor existing application templates for RH-SSO for OpenShift image to dynamically create necessary Java keystores/truststores in OpenShift

Currently available application templates for RH-SSO for OpenShift image expect the user to provide definition of:

• SSL keystore,
• JGroups keystore, and
• SSL truststore

in order the TLS (https) configuration for the image to work correctly. Since the SSL keystore / truststore and JGroups keystore configuration is not trivial, it creates initial barrier for image adoption / use.

To lower this initial barrier, the RH-SSO application templates should be refactored to:

• Utilize the OpenShift's internal / integral serving certificate secrets service functionality to generate the TLS certificate / key pair automatically,
• Utilize re-encrypt TLS mode / route type instead the current passthrough one,
• Use the OpenShift's init containers functionality to convert the previously generated PEM format based TLS certificate/key pair into PKCS12 format, and dynamically create necessary Java keystore/truststore from these.

Demo implementation / blog about the idea:

• https://developers.redhat.com/blog/2017/11/22/dynamically-creating-java-keystores-openshift/

Other resources / examples:

• https://github.com/jboss-container-images/datagrid-7-image/blob/datagrid-services-dev/templates/caching-service.json#L38
• https://github.com/jboss-container-images/datagrid-7-image/blob/datagrid-services-dev/templates/caching-service.json#L275-L317
• https://github.com/jboss-container-images/datagrid-7-image/blob/datagrid-services-dev/templates/caching-service.json#L261